181. Employees Earning More Than Their Managers

Description

SQL Schema

The Employee table holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id. 

+----+-------+--------+-----------+
| Id | Name  | Salary | ManagerId |
+----+-------+--------+-----------+
| 1  | Joe   | 70000  | 3         |
| 2  | Henry | 80000  | 4         |
| 3  | Sam   | 60000  | NULL      |
| 4  | Max   | 90000  | NULL      |
+----+-------+--------+-----------+

Given the Employee table, write a SQL query that finds out employees who earn more than their managers. For the above table, Joe is the only employee who earns more than his manager. 

+----------+
| Employee |
+----------+
| Joe      |
+----------+

My Solution

Source Code

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​
SELECT e.[name] as 'Employee'
FROM Employee AS e
INNER JOIN Employee AS m
ON m.id = e.managerid
WHERE e.salary > m.salary
​

Analysis

There is nothing exciting about this one. All that needs to be done is do an INNER JOIN. I guess that if you didn't alias your tables with descriptive names, it could get confusing.